Two approaches to modelling the heating of evaporating droplets

Two approaches to modelling the heating of evaporating droplets
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模拟蒸发液滴加热的两种方法

DOI:
10.1016/j.icheatmasstransfer.2014.08.004
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发表时间:
2014
影响因子:
7
通讯作者:
Sazhin S
Sazhin S
中科院分区:
工程技术2区
文献类型:
--
作者:
Sazhin S

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两种方法来模拟蒸发液滴的加热已被广泛用于工程应用。在第一种方法中,提供给液滴以提高其温度的热速率q stecd是从液滴蒸发速率的要求导出的,液滴蒸发速率是从质量和热平衡的稳态方程推断的,应该是相同的。第二种方法是直接计算液滴内部的温度分布,假设它们的导热系数不是无限大。这两种方法的影响进行了比较的情况下,固定液滴的条件下,柴油机。指出虽然两种方法预测的q stecd随时间的变化趋势相似,但实际预测的q stecd值可能存在明显差异。这种差异可能导致预测的液滴表面温度、半径和蒸发时间的显著差异。这些差异的可能原因进行了讨论。
Two approaches to modelling the heating of evaporating droplets have been widely used in engineering applications. In the first approach the heat rate supplied to the droplets to raise their temperatures, q˙ d, is derived from the requirement that droplet evaporation rates, inferred from steady-state equations for mass and heat balance, should be the same. The second approach is based on the direct calculation of the distribution of temperature inside droplets assuming that their thermal conductivity is not infinitely large. The implications of these two approaches are compared for the case of stationary droplets in conditions relevant to Diesel engines. It is pointed out that although the trends of time evolution of q˙ d predicted by both approaches are similar, actual values of q˙ d predicted by these approaches can be visibly different. This difference can lead to noticeable differences in predicted droplet surface temperatures, radii and evaporation times. Possible reasons for these differences are discussed.
DOI: --
发表时间: 2014
期刊:
影响因子: --
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